CN100571880C - A kind of process of floating tail-coal graded recovery - Google Patents
A kind of process of floating tail-coal graded recovery Download PDFInfo
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- CN100571880C CN100571880C CNB2007100616314A CN200710061631A CN100571880C CN 100571880 C CN100571880 C CN 100571880C CN B2007100616314 A CNB2007100616314 A CN B2007100616314A CN 200710061631 A CN200710061631 A CN 200710061631A CN 100571880 C CN100571880 C CN 100571880C
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Abstract
A kind of process of floating tail-coal graded recovery belongs to the solid-liquid separation technique field, is used for solving the flotation tailing problem that reclaims to greatest extent.It utilizes the classifying cyclone group that floating tail-coal is carried out classification, and screen-bowl sedimentation centrifuge reclaims coarse slime, and dehydration back product moisture content is 14～18%, and the recovery granularity is 0.045～3mm, accounts for 55～60% of floating tail-coal amount; Filter press reclaims fine coal slurry, and filter press dehydration back product accounts for 40～45% of floating tail-coal amount.The inventive method has been filled up the blank of this technical finesse floating tail-coal of domestic and international use, a kind of low input, high benefit are proposed, technology is simple, automaticity is high floating tail-coal reclaims process, it is simple to have process system, product moisture is low, material becomes to loose shape, can be incorporated into coal or the medium advantage of other thermal coal in the end.Have good economic benefit and social benefit with regard to recoverable investment half a year.
Description
Technical field
The present invention relates to a kind of method of handling floating tail-coal, the method that particularly adopts the classifying cyclone group that floating tail-coal is carried out classification and reclaims by different process belongs to the solid-liquid separation technique field.
Background technology
Flotation is the effective and the most the most frequently used a kind of method of present fine slime sorting.According to the principle that coal resources effectively utilize, the ash content of floating tail-coal reaches 49% and can be used as mine tailing when above and directly give up.For difficult-to-float coal, when particularly the ash content of floatation clean coal required to hang down, floating tail-coal was difficult to reach this requirement, and the ash content of the floating tail-coal of present most coal preparation plants is not high, still has very high value.According to statistics, the floating tail-coal that domestic emphasis colliery coal preparation plant produces this year reaches more than the 5.0Mt, and is the trend that rises year by year, and ash content is about 30%.Therefore, the recovery of floating tail-coal has important practical significance.
Traditional floating tail-coal reclaims technology, according to raw coal character and product requirement, 5 kinds of typical black water handling processes is arranged, and has provided the pluses and minuses and the scope of application of various flow processs in the table 1.
The pluses and minuses of the various flow processs of table 1 and the scope of application
| The black water flow process | Advantage | Shortcoming | The scope of application |
| Direct flotation-tail coal concentrates-press filtration | Be easy to realize that wash water is closed circuit, cleaned coal is fully reclaimed, and economic and environmental benefit is good | Investment is big, the operating cost height | Big-and-middle-sized coking coal coal preparation plant |
| Coal slime heavily is situated between-and tail coal concentrates-press filtration | Separation of coarse slime precision height is invested less | Cleaned coal mud reclaims lower limit 0.1mm, and the tail coal amount is big | Full weight is situated between, difficult-to-float coal coal preparation plant |
| Black water Jie gravity preparation-coarse slime directly reclaims-the concentrated press filtration of fine coal slurry | The investment and operating cost than direct flotation-tail coal concentrated-the press filtration flow process is low slightly | Be suitable for separating density 1.6kg/L above easily select coarse slime, the fine coal slurry amount is big, the dehydration difficulty | Thermal coal coal preparation plant and small-sized coking coal coal preparation plant |
| Black water concentrates-directly reclaims | Invest less | Economic benefit is low, the coal slime dewatering difficulty, and the equipment consumption is big, and the closed circuit difficulty of wash water is big | Thermal coal coal preparation plant and small-sized coking coal coal preparation plant |
| Slurry pond | Invest for a short time, producing cost is low | Wash water can not be closed circuit, and environmental pollution is serious, serious waste of resources | Small-sized coal preparation plant |
In the big-and-middle-sized coking coal coal preparation plant, adopt tail coal to concentrate-filter-pressing process, promptly the floating tail-coal ore pulp directly enters thickener more, and thickener underflow is reclaimed by filter press, and as the coal slime direct marketing, overflow is as recirculated water.This method technology is fairly simple, be easy to realize the wash water closed cycle, but because the thickener investment is high, the filter press disposal ability is low, cause this traditional handicraft to exist shortcomings such as production efficiency is low, operating cost is high, capital expenditure height, and product moisture height, viscosity that filter press is produced are big, price is very low, has influenced the economic benefit of coal preparation plant.In addition, when coarseness coal slime in the tail coal too much when (+0.5mm surpasses 6～8%), cause easily that stifled, the sticking filter cloth of filter press centre bore, discharging difficulty, filter cloth damage, the press filtration disposal ability reduces, even causes thickener to be delayed unloading.
Summary of the invention
The process that the present invention seeks to solve the defective of above-mentioned prior art and a kind of floating tail-coal graded recovery is provided, utilize classifying cyclone that floating tail-coal is carried out classification, the coarseness coal slime reclaims with the filter press dehydration with screen-bowl sedimentation centrifuge dehydration recovery, fine granularity coal slime, improves the ratio that coarse slime mixes coal in the end that reclaims.
The alleged problem of the present invention is solved by following technical scheme:
A kind of process of floating tail-coal graded recovery, its special feature is: it utilizes the classifying cyclone group that floating tail-coal is carried out classification, and screen-bowl sedimentation centrifuge reclaims coarse slime, and filter press reclaims fine coal slurry, and described method is made up of following operation:
A. classification: the classified cyclone fraction level of floating tail-coal, partition size is 0.075～0.15mm; The floating tail-coal pulp density is 3～6%, and ash content is 30～49%.
B. screen-bowl sedimentation centrifuge dehydration: classifying cyclone group underflow is gone into screen-bowl sedimentation centrifuge, and pan feeding concentration is 25～35%;
C. concentrate: overflow of classifying cyclone group and screen-bowl sedimentation centrifuge centrifugate are gone into thickener and are concentrated, and thickener pan feeding concentration is 2.00-3.50%;
D. filter press dehydration: concentrated underflow is gone into the filter press dehydration, filter cake moisture content 27-29%, and overflow is used as recirculated water.
The process of above-mentioned floating tail-coal graded recovery, in the described screen-bowl sedimentation centrifuge dehydration procedure, dehydration back product moisture content is 14～18%, and the recovery granularity is 0.045～3mm, account for 55～60% of floating tail-coal amount, filter press dehydration procedure product accounts for 40～45% of floating tail-coal amount.
The inventive method adopts the classifying cyclone group earlier floating tail-coal to be carried out classification; Again coarseness coal slime after the classification is dewatered with screen-bowl sedimentation centrifuge, the process that the fine granularity coal slime is dewatered with filter press, this method provides a kind of effective brand new technical for handling the floating tail-coal field both at home and abroad, the new way that has found floating tail-coal to reclaim, a kind of low input is proposed, high benefit, the simple floating tail-coal of technology reclaims technology, the floating tail-coal coarse slime moisture that uses this method processing is at 14-18%, material becomes diffusing shape, can be incorporated in the end in coal or other thermal coal, the coarse slime that adopts this method processing floating tail-coal can reclaim 55-60% mixes coal in the end more, has good economic benefit and social benefit.Through measuring and calculating, adopt this method, be the coal preparation plant of 400mt/a with regard to recoverable investment for disposal ability half a year, a year wound benefit can reach more than 2,800 ten thousand yuan.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
Its crucial part of the present invention is that one section processing by the prior art floating tail-coal has become the employing hydrocyclone and carried out two sections processing after as classification, and first section mainly is to reclaim coarse slime (usually+200 orders), guarantees the closed circuit and recirculated water concentration of wash water for second section.This method adopts the hydrocyclone group as classifying equipoment, and classification is reclaimed granularity and can be adjusted according to one, two section requirement.Coarse slime adopts the screen-bowl sedimentation centrifuge dehydration, can obtain lower moisture, and mix coal in the end.Because most of coal slime is reclaimed by screen-bowl sedimentation centrifuge, have only the small part fine coal slurry to need thickener and filter press to handle, so the quantity of thickener, filter press reduce, their main effect is to guarantee primary water and wash water closed cycle.
Referring to Fig. 1, the present invention goes into the mine tailing bucket with flotation tailing, squeeze into the classifying cyclone group with pump, classifying cyclone group underflow is gone into the screen-bowl sedimentation centrifuge dehydration by baffle-box, product after the dehydration is reprinted by belt feeder and is mixed coal in the end, and centrifugate and the overflow of classifying cyclone group are gone into thickener and concentrated, and the thickener overflow is used as recirculated water, underflow is squeezed into filter press dehydration with pump, and filter cake lands sale.Described method shows by a large amount of half industrialness, result of industrial test, the floating tail-coal that adopts process of the present invention to handle, reach re-set target, coarse slime moisture is 14～18%, material becomes diffusing shape, can be incorporated in the end in coal or other thermal coal, favorable economic benefit and social benefit are arranged.And invest the required fund of this method not as good as 1/2nd of conventional method.Below provide a specific embodiment.
One coal preparation plant uses the classifying cyclone group of diameter 350mm that floating tail-coal is carried out classification, pan feeding concentration is 5.12% o'clock, underflow density 32.92%, effluent concentration 1.84%. partition size 0.08mm (near 200 orders), classification efficiency 40%, thickening efficiency 60.39%, underflow solid recovery rate 67.86%.Because particulate is few in the underflow, be suitable for the screen-bowl sedimentation centrifuge dehydration, and coarse granule is few in the overflow, is suitable for filter press and reclaims.Table 2 is classifying cyclone result of the tests.
Table 2 FX350-PU*12 type hydrocyclone engineer testing data
Through the coarse slime of screen-bowl sedimentation centrifuge dehydration, product moisture 14～16%, caloric value 19.82-20MJ/Kg can mix middle coal.The filter liquor concentration 4.11-5.15% of screen-bowl sedimentation centrifuge goes into thickener with the overflow of cyclone group, and thickener pan feeding concentration is 2.03-3.06%.
Fine coal slurry reclaims through plate and frame filter press, average moisture 28%.Table 3 is product moistures before and after the system reform.
Floating tail-coal product moisture before and after table 3 is transformed
Claims (2)
1. the process of a floating tail-coal graded recovery, it is characterized in that: it utilizes the classifying cyclone group that floating tail-coal is carried out classification, and screen-bowl sedimentation centrifuge reclaims coarse slime, and filter press reclaims fine coal slurry, and described method is made up of following operation:
A. classification: the classified cyclone fraction level of floating tail-coal, partition size is 0.075～0.15mm; The floating tail-coal pulp density is 3～6%, and ash content is 30～49%;
B. screen-bowl sedimentation centrifuge dehydration: classifying cyclone group underflow is gone into screen-bowl sedimentation centrifuge, and pan feeding concentration is 25～35%;
C. concentrate: overflow of classifying cyclone group and screen-bowl sedimentation centrifuge centrifugate are gone into thickener and are concentrated, and thickener pan feeding concentration is 2.00-3.50%;
D. filter press dehydration: concentrated underflow is gone into the filter press dehydration, filter cake moisture content 27～29%, and overflow is used as recirculated water.
2. the process of floating tail-coal graded recovery according to claim 1, it is characterized in that: in the described screen-bowl sedimentation centrifuge dehydration procedure, dehydration back product moisture content is 14～18%, the recovery granularity is 0.045～3mm, account for 55～60% of floating tail-coal amount, filter press dehydration procedure product accounts for 40～45% of floating tail-coal amount.
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| CNB2007100616314A CN100571880C (en) | 2007-03-26 | 2007-03-26 | A kind of process of floating tail-coal graded recovery |
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| CN101284254B (en) * | 2008-06-04 | 2012-09-05 | 神华集团有限责任公司 | Floatation coal separation technique |
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| CN101757982A (en) * | 2010-03-09 | 2010-06-30 | 中国矿业大学 | Coal slime floating process |
| CN102399028A (en) * | 2010-09-16 | 2012-04-04 | 永城煤电控股集团有限公司 | Technology for treating coal slime water through secondary flow and settlement filtering centrifuge |
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| CN102897950A (en) * | 2012-10-18 | 2013-01-30 | 中煤科工集团武汉设计研究院 | Method for treating coal slurry water at long-distance pipeline coal transporting terminal |
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| CN108855586B (en) * | 2017-05-12 | 2020-08-21 | 山西世纪新龙腾科技有限公司 | Combined unit for coal flotation |
| CN109604047A (en) * | 2018-12-20 | 2019-04-12 | 新矿内蒙古能源有限责任公司洗煤分公司 | It is a kind of based on the tailing recycling technique optimized product structure and system |
| CN110404665B (en) * | 2019-07-08 | 2021-07-06 | 陕西永明煤矿有限公司 | Treatment method for dewatering superfine coal slime |
| CN110976067A (en) * | 2019-11-25 | 2020-04-10 | 金堆城钼业股份有限公司 | Process for dewatering concentrated sulfur pulp |
| CN113023937B (en) * | 2021-03-05 | 2023-05-09 | 唐山亿思特选煤科技有限公司 | Tail coal slime water treatment device and method for wet coal preparation plant |
| CN113310852B (en) * | 2021-05-27 | 2023-05-12 | 冀中能源股份有限公司 | Evaluation method of flotation effect |
| CN114653474B (en) * | 2022-05-05 | 2024-02-06 | 陕西博选科技有限公司 | Deep upgrading technology for slime water |
| CN115041295A (en) * | 2022-06-16 | 2022-09-13 | 中煤科工集团北京华宇工程有限公司 | Coal slime flotation and recleaning process |
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